Catch a system error that OSX's SFML produces since it's at the end and looks like just a cleanup mistake.

main.cpp

@@ -2,8 +2,10 @@
 #include "textures.hpp"
 #include "sound.hpp"
 #include "autowalker.hpp"
+#include <iostream>
 
 int main(int argc, char* argv[]) {
+  try {
     textures::init();
     sound::init();
     sound::mute(false);
@@ -39,4 +41,10 @@ int main(int argc, char* argv[]) {
     }
 
     return 0;
+  } catch(const std::system_error& e) {
+    std::cout << "WARNING: On OSX you'll get this error on shutdown.\n";
+    std::cout << "Caught system_error with code "
+                 "[" << e.code() << "] meaning "
+                 "[" << e.what() << "]\n";
+  }
 }